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Stockholders' Equity - Warrant Activity (Details) - $ / shares | Dec. 31, 2021 | Dec. 31, 2020
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Class of Warrant or Right [Line Items] |  |
Number of warrants (in shares) | 5,636,801 | 5,996,112
2020 Convertible Notes warrant |  |
Class of Warrant or Right [Line Items] |  |
Cash exercise price per share (in dollars per share) | $ 2.25 | $ 4.00
Number of warrants (in shares) | 35,555 | 2,160,000
Common stock warrant (Series D-1) |  |
Class of Warrant or Right [Line Items] |  |
Cash exercise price per share (in dollars per share) | $ 2.25 | $ 5.54
Number of warrants (in shares) | 377,402 | 14,866
Common stock warrants (Series F) |  |
Class of Warrant or Right [Line Items] |  |
Cash exercise price per share (in dollars per share) | $ 9.22 | $ 9.22
Number of warrants (in shares) | 1,761,291 | 377,402
Public Warrants (PHUNW) |  |
Class of Warrant or Right [Line Items] |  |
Cash exercise price per share (in dollars per share) | $ 11.50 | $ 11.50
Number of warrants (in shares) | 1,658,381 | 1,761,291
Private Placement Warrants |  |
Class of Warrant or Right [Line Items] |  |
Cash exercise price per share (in dollars per share) | $ 11.50 | $ 11.50
Number of warrants (in shares) | 1,780,000 | 1,658,381
Unit Purchase Option Warrants |  |
Class of Warrant or Right [Line Items] |  |
Cash exercise price per share (in dollars per share) | $ 11.50 | $ 11.50
Number of warrants (in shares) | 24,172 | 24,172

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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